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7/23/2019 I- The Movement of the Sun in the Sky Dome http://slidepdf.com/reader/full/i-the-movement-of-the-sun-in-the-sky-dome 1/21  THE SUN PATH  THE VISIBLE PART OF THE SKY FROM ANY LOCATION IS CALLED THE SKY DOME  THE POSITION OF THE SUN CHANGES IN THE SKY DOME FOR DIFFERENT TIMES OF THE DAY DIFFERENT TIMES OF THE YEAR AND FOR DIFFERENT LATTITUDES  THE POSITION OF THE SUN IN ALL THESE PARAMETERS HAS BEEN MAPPED IN THE SUN PATH DIAGRAM 1

I- The Movement of the Sun in the Sky Dome

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Page 1: I- The Movement of the Sun in the Sky Dome

7/23/2019 I- The Movement of the Sun in the Sky Dome

http://slidepdf.com/reader/full/i-the-movement-of-the-sun-in-the-sky-dome 1/21

 THE SUN PATH

• THE VISIBLE PART OF THE SKY FROM ANY

LOCATION

IS CALLED THE SKY DOME

• THE POSITION OF THE SUN

CHANGES IN THE SKY DOME FOR

•DIFFERENT TIMES OF THE DAY 

•DIFFERENT TIMES OF THE YEAR AND

•FOR DIFFERENT LATTITUDES

•  THE POSITION OF THE SUN IN ALL THESE

PARAMETERS HAS BEEN MAPPED IN THE

SUN PATH DIAGRAM

1

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 THE SUN MOVEMENT AT DIFFERENT TIMES- THRU ONE DAY

2

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 THE SUN MOVEMENT AT A GIVEN TIME - THRU ONE YEAR

3

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  BECAUSE OF THE TILT OF THE EARTH’S AXIS

THE SUN POSITION

IN THE SKY DOME KEEPS CHANGING THRU THE

 YEAR

WHEN THE SUN SHINES OVER THE TROPIC OF CANCER

WE HAVE SUMMER IN THE NORTHERN HEMISPHERE

AND WHEN THE SUN SHINES OVER THE TROPIC OF CAPRICORN

WE HAVE WINTER IN THE NORTHERN HEMISPHERE

LET US EXPLORE A FEW EXAMPLES FOR SUN POSITIONS IN4

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IMPORTANT DATES

GIVENT THIS CYCLICAL NATURE, THERE ARE FOUR IMPORTANT

DATES TO REMEMBER WHEN CONSIDERING SOLAR POSITION:

• Summ! S"#$%&' 22 D'( SOUTHERN HEMISPHERE

•   22 )u*( NORTHERN HEMISPHERE

SUN IS AT ITS HIGHEST NOON ALTITUDE

• Au%um* E+u&*"  21 M!( SOUTHERN HEMISPHERE

•   21 S.( NOTHERENHEMISPHERE

SUN RISES DUE EAST, SETS DUE WEST

• W&*%! S"#$%&'  21 )u*( SOUTHERN HEMISPHERE

•   21 D'( NOTHERN HEMISPHERE

SUN IS AT ITS LOWEST NOON ALTITUDE

• S.!&*/ E+u&*" 21 S.( SOUTHERN HEMISPHERE

•   21 M!( NOTHERN HEMISPHERE

 THE SUN RISES FROM DUE EAST 0 SETS DUE WEST(

ALTITUDE ANGLE OF THE SUN DEPENDS ON THE LATITUDE

3N

3S

EUATOR

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SUN POSITION ATSOLSTICES

AT O EUATOR

5

1( THE CURVEDDOTTED LINE IS THE S6Y DOME

2( THE BLAC6 SOLIDSTRAIGHT LINE

DEPICTS THEMOVEMENT OF THE SUN ON 21ST MARCH WHEN IT ISSHINING OVER THE EUATOR

3( THE STRAIGHTDOTTED LINESSHOW THEMOVEMENT OF THE SUN AT ALL

OTHER TIMESWHICH WILL BE

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SUN POSITION ATSOLSTICES

AT O EUATOR

7

1( THE SUN ISDIRECTLYOVERHEAD ON21ST MARCH

2( SHINING OVER T(O(CANCER IT ISLOWER IN THENORTHERNHEMISPHERE

3( AND WHEN OVER THE T(O(CAPRICORN ITIS IN THESOUTHERN

HEMISPHERE

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AT 1 NORTH

8

AT 1NORTH, THESUN WILLGENERALLYAPPEAR TO

LIE TOWARDS THESOUTHERNS6Y

IT WILLPASSOVERHEAD TWICE A YEAR ON ITSWAY TO AND

FROM THEE UATOR

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AT 2 NORTH

9

AS WEAPPROACH THE TROPIC

OF CANCER, THE SUNWILL APPEARALMOSTOVERHEADAROUND 21

 )UN WHEN ITSHINES OVER TROPIC OFCANCER

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AT 3 NORTH

1

AT 3 NLATITUDE THE SUNWILL ALWAYSBE IN THESOUTHERNS6Y ATNOON(

 THE DOTTED

STRAIGHTLINE SHOWS THE SUNSPATH DURING THAT DAY

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AT 5 NORTH

11

NOTICE THAT

 THE SUN PATHPASSES THRU THE CENTREWHEN IT ISSHINING AT THE EUATOR

0ON 21ST )UNEAND 22 DECITS PATH ISPARALLEL TO THAT ON 21ST 

MARCH

 THE SUMERDAYS AREGETTINGLONGER AND

 THE WINTERDAYS ARE

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SUN POSITION ATEUINO;ES

AT O EUATOR

12

AGAIN STARTINGAT THE EUATORLET USUNDERSTAND THESUNS PATH THRU THE YEAR ASSEEN IN THESOUTHERN

HEMISPHERE

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AT 1 SOUTH

13

MOST TIMESOF THE YEAR THESUN WILL

APPEAR IN THENORTHERNS6Y

IT WILL BEIN THESOUTHERNS6Y DURINGITS )OURNEY TO THE TROPIC OFCAPRICORN

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AT 2 SOUTH

14

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AT 3 SOUTH

1

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AT SOUTH

15

 THE SUNWILL ONLYAPPEAR IN THENORTHERN

S6Y E;CEPTEARLYMORNINGAND LATEEVENINGS IN THE SUMMERMONTHS ASSEEN BY THEDOTTEDLINEFROM22DEC

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AT 5 SOUTH

17

THE

ANTARCTIC

CIRCLE LIES

AT 66*S

IF YOU DRAW THE FULLEARTH CIRCLEAS SEEN BY THE CURVEDDOTTED LINE, YOU WILLNOTICE THATON 22 DEC

 THERE ISHARDLY ANY<NIGHT

WHILE ON THE 21ST OF

 )UNE THE SUNIS VERY LOW

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AT 8 SOUTH

18

NOTICEHOW THE

SUNNEVERSETS ON THE 22ND OFDECEMBE

R BUTROTATESAROUND THE S6Y>

AND IN

MAY,)UNE, )ULY ,AUGUST THE SUNIS NOTVISIBLE

AT ALL(

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AT 9 SOUTH

19

AT THE

SOUTHPOLE THESUN ISROTATINGAT THEHORI=ON

ON 21ST MARCH

0ROTATINGVERY LOWIN THE S6Y

ON 22ND DECEMBER(

IT IS NOTVISIBLE ATALL FROMAPRIL TO

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UDERSTANDING THE S6YDOME

2

 THE SUN AS IT MOVESACROSS THE S6Y DURING THE DAY AND ACROSS THE SEASONS OF THE YEAR ARE INDICATEDHERE ON THE S6Y DOME

IF THESE PATHS AREVIEWED IN PLAN WE GET

OUR SUN PATH DIAGRAMFOR A GIVEN LATITUDE(

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 THE SUN ALWAYS MOVES AROUND

 THE CENTER OF THE S6Y DOME

21

 TWO IMPORTANT VALUES ARE READ OFF THE SUN PATHDIAGRAMFOR A GIVEN LAITITUDE:

1( THE AZIMUTH ANGLE &(( %? ?"!&@"*%# */# "* %??"!&@"*

m$u! '#"'&$ !"mNORTH2( THE ALTITUDE ANGLE &(( %? !%&'# */# %? $u*m$ %" %? /!"u*